Car-wheel.



surface to the bearing-face ofthe rail 4, while.

. UNITED STATES Patented January 24, 1905.

PATENT I OFFICE.

ISIDORE H. sAMPERs, or NEW YORK, N. Y., ASSIGNOR To THE NOISELESS CARAND OAR WHEEL COMPANY, or NEW YORK, N. Y., AVOORPORA- TION OF NEW YORK.

OAR-WHEEL.

SPECIFICATION forming part of Letters Patent No. 780,531, dated January24, 1905. Application filed September 26, 1903. Serial No. 174,711.

To all whom it may concern;

Be it known that I, ISIDORE H. SAMPERS, a citizen of the United States,and a resident of the borough of Manhattan, in the city and State of NewYork, have invented a new and useful Improvement in Car-Wheels, of whichthe following is a specification.

My invention relates to an improvement in car-wheels, and moreparticularly to the construction of the rim and tire, with the object inview of preventing the tire from creeping or bulging and becoming setout of its normal shape.

A practical embodiment of my invention is represented in theaccompanying drawing, which represents a transverse section through therim and tire and through aportion of the rail on which the tire isintended to bear.-

The wheel-rim consists of a base 1 and a flange 2, the base being thatportion to which the spokes 3 are attached and the flange 2 being thatportion which is extended down past the bearing-face of the rail to holdthe wheel on the track. I

The base 1 preferably presents acylindrical the flange 2 leaves the baseata point inward from the inner edge of the bearing-face of the rail andgradually curves outward toward that edge as the retaining portion '5 ofthe flange approaches the bearing-face of the rail.

A keeper 6 of annular form, with a portion 7 embedded in the elastictire 8 after the man'- ner. shown, described, and claimed in Patent No.7 29,450, granted to Romeo P. Tomassek May 26, 1903, is bolted to therim by means of screw-bolts 9 and differs from that shown in the patentabove referred to in that it not only extends along down the outer faceof the tire, but also curves over the outer corner of the tire, as shownat 10, to prevent the creeping of the the outwardly and downwardlybetween it and the bearing-face of the rail on which the tire rests. Inthis respect it coacts with the outwardly curved portion of the flange 2to prevent the elastic tire from flowing out of shape under greatpressure.

' The gist of my present inventionlies in the structure of the rim,keeper, and tire in such manner that the tire 8, which because of theoutward curve of the flange 2 and inward curve of the keeper 6, as setforth, has a width materially greater than the width of the bearing-faceof the rail, will have its center of mass or central line of pressureabout midway of the bearing-face-Of the rail. It is found that'this willprevent the elastic tire 8 from gradually becoming upset undercontinuous pressure, keeping it at all times in its normal shape, and sowill not only increase the life of the tire, but will cause the wheel torun smoothly.

The dotted line A A is placed upon the present drawing to indicate thecentral line of bearing-pressure, and it will be observed that the rimis so constructed and the tire so fitted to the rim that the mass of thetire is about equally divided, one half upon one side ofthe lirle A Aand the other half upon the opposite s1 e.

As the mass of the tire under great pressure has a tendency to recedefrom the bearing-- face of the rail, it is held both upon its inner andouter faces against escape, and' becomes so poised under this pressurethat neither side will be allowed to creep farther away from the normalthan the adjacent side, and the tire will thus be maintained in itsnormal position.

What I claim is 1'. In a car-wheel, the combination with a rim, of anelastic tire of greater width than the bearing-face of the rail andsecured to the rim with the central line of pressure on the bearing-faceof the rail substantially coincident with the central line of mass ofthe tire. 2. In a car-wheel, the combination with a rim and an elastictire of greater width than the bearing-face of the rail, of a keeper fortheelastic tire fastened to the rim, thesaid keeper being extended downthe outer side of the tire andcurved inwardly over the-outer edge of thetire. In testimony that I claim the foregoing as my invention I havesigned my name, in presence of two witnesses, this 2&th day ofSeptember, 1903.

' ISIDORE H. SAMPERS. Witnesses:

FREDK. HAYNES, HENRY THIEME.

